Drilling-machine.



No. 642,965. Patented Feb. 6, I900. L. M. DAVJS.

DRILLING MACHINE.

(Applicatio'h filed Mar. 20, 1899.) (No Model.) 2 Sheets-Shut l.

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WITNEEEEE No. 642,965. Patented Feb. 6, I900.

L. M. DAVIS.

DRILLING MACHINE.

(Application filed Mar. 20, 1899.) (No Model.)

2 Sheets-Sheet 2.

MTNEEEEE i fl f L/Q/v UNrrnn STATES Fries.

PATENT LEONARD M. DAVIS, OF MILLERS FALLS, MASSACHUSETTS, ASSIGNOR TOTHE MILLERS FALLS COMPANY, OF SAME PLACE.

DRILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 642,965, dated February6, 1900.

Application filed March 20, 1899. Serial No. 709,730. (No modehl T0IJLZZ whom, it may concern:

Be it known that I, LEONARD M. DAVIS, of Millers Falls, in the town ofErving, in the county of Franklin and State of Massachusetts, haveinvented certain new and useful Improvements in Drilling-Machines,'ofwhich the following is a specification.

My present invention relates to that class of mechanics tools calledbreast-drills.

In the drawings, Figure 1 is an elevation of the drill. Fig. 2 is anelevation, partly in sec tion, on theline2 2 of Fig. 1. Fig. 3 is aview, partly in section, on the line 3 3 of Fig. 1. Fig. 4 representsthe dog and its spring detached.

My present invention has more particular regard to certain details ofconstruction'operating in combination with the general parts of the toolalready in use and which details will hereinafter be speciallydescribed.

In the drawings, A is the main stationary drill-spindle, having at itslower end the movable spindle B, suitably united to the same andarranged to revolve the chuck B, with the usual jaws. The upper part ofth spindle is detachable and is represented by A, the breast-piece beingsecured to the upper end of A by means of its socket A and held by aset-screw or in any convenient way.

At the upper end of the main spindle A is formed the socket part a,which socket has the projecting part 0.2 and through which projectionand also through the socket part a is a hole of suitable size to receivethe lower end of the detachable part of the spindle A. The position ofthis piece A when placed in the projecting part a is shown by the dottedlines in Fig. 1. The detachable part is secured to the main spindle inthe socket a by the set-screw a This device for shifting the upper partof the spindle enables the breast part to be used either in the ordinaryway or at right angles to the main spindle. This is quite important inusing the tool in certain positions and for special purposes.

011 the main stationary spindle is placed the slide D, which moves upand down on spindle A. It is prevented from turning around. by a key orspline D and is held in place either high or low by the thumb-screw c,which screw part passes through the side of the slide and pressesagainst the side of the spindle A. Just below the slideis placed a smallgear-wheel E, secured to the movable spindle B. The slide D has also onone side the handle 0, which-is provided with a screw part to enter athread formed in the thumbsc-rew c. Whereitis necessary, the handle 0can be detached. In ordinary work it is very useful in holding andsteadying the tool. On the opposite side from the handle C, secured toor forming a part of the slide, is the short arbor N, on which isloosely journaled the gear-wheel H and also the crank-holder L, both thegear-wl1eel and the holder being held in place by the threadedthumb-screw h, which is provided with a slight flange, which whenscrewed up against the outer end of the holder brings all the partstogether and holds them in position. The gear-wheel H is provided withtwo sets of gear-teeth on the inside. of the wheel, as indicated by Gand F. Either of these sets of teeth may mesh with the teeth of the gearE, secured to the spindle B.

By slightly turning outward the thumbscrew h the gear-wheel H will bedetached from the gear E, and by loosening the setscrew 0 the slide canbe moved upward, carrying the gear-wheel H and other parts, and thegear-wheel E can be meshed with teeth Ginstead of teeth F, thus givingtwo motions, one fast and the other slow, according to the requirementsof the work, the parts being held in contact by the thumb-screw h, whilethe position of the slide is secured by the setnut c.

On the outer face of the Wheel H and preferably near the arbor areformed the notches m. In connection with the holder L is placed the dogd. The dog is shown in Fig. 4:. It is operated, preferably, by thespiral spring at, and its inner end is formed with one part of the end dbeveled. Now when the dog is placed in its position in the holder L, asshown in Fig. 3, the force of the spring 01 will press the inner end ofthe dog against the notched part m of the gear-wheel H and when anopening is reached will drop in, thus securing the holder L to thegear-wheel H, and when the crank K, with its handle K, is placed in theholder L and secured in position by set-screw Z and is turned orrevolved the power will of course be communicated to the gear-wheel Hand thence to the gear E, and so the spindle of the machine. On theouter end of the holder, where the dog (1 is placed, are formed threeslots or notches, which are indicated by 'n n n ,'Fig. 1. The pin (1Fig. 4, fits into the slots or notches n a 91 This prevents the turningof the dog d. It will be seen that when the pin (1 rests in slot at theend of the dog will be held tightly between the notches, and thus thetool can be operated in either direction. hen the dog is withdrawn andturned to the right and the pin d drops into notch or slot 01 the innerend of the dog will be presented to the notches m, so that the thick endwill catch and turn the wheel II but on account of the bevel d of theend of the dog d the notches on will not catch, but will slide over.When the dog is reversed and the pin (1 rests in slot at, the end of thedog will engage the notches m in exactly the reverse manner from thatnext previously described. Thus it is that by the simple adjustment ofthe dog (Z in relation to its end having the bevel part d the machinecan be operated backward or forward withou t change or operated forwardonly and the parts forming a sort of a ratchet attachment, or themachine can be operated backward only. In either of the two latter casesthe dog would not operate except in one direction. By this means theoperator is enabled to make a part of a revolution of the crank K.

In some positions it is impossible to have room enough to move thecrank, for operation of the tool, but a slight distance, and in thesecases the present device works perfectly.

The crank part K is preferably held from twisting in the holder by theuse of a key or spline, (represented by Z, Fig. 2.)

The details of the tool are so clearly shown in the drawings that thewhole will be understood without a more extended description.

I am aware that breast-drills are not new, also that gears for providingtwo different speeds have been used before, and that chucks and jaws ofvarious kinds have been employed, and I do not claim them; but

What I do claim as new, and for which I desire to secure Letters Patentof the United States, is

1. The combination, in a breast-drill, of the main spindle A, providedwith the socket a, having the projection a ,and the thumb-screw a withthe detachable spindle A, adapted to fit into the socket a, either inprolongation of the main spindle or at right angles thereto,substantially as and for the purposes set forth.

2. The combination of the stationary drillspindle A; the movable spindleB, provided with the beveled gear-wheel E; the slide D, movably securedto the said spindle A, and having the arbor N; the gear-wheel H, havingthe internal gear-teeth G, the bevel-gearwheel attachment F, and theexterior teeth on, the said wheel H, loosely journaled on said arbor N;the crank and operating holder L, provided with suitable apertures forreceiving the crank K, and the dog d, and also having suitable means forholding or securing the said crank and dog in said holder; the saidholder loosely journaled 011 arbor N; the dog d adapted to be movableand reversible in connection with its operation with teeth m, and havingthe spring d; and the securing set-screw h, adapted to hold the saidwheel H, and the holder L, together; and also, to hold the said wheel H,in operative connection with the gear-wheel E, and also to enable thesaid parts to be disconnected and readjusted, all substantially as andfor the purposes set forth.

In testimony whereof I have affixed my signature, in presence of twowitnesses, this 13th day of March, A. D. 1899.

LEONARD M. DAVIS.

Vfitnesses:

M. E. SHEPARD, GEO. W. Nuts.

